MinimalNav

{{
  "language": "Solidity",
  "sources": {
    "@chainlink/contracts/src/v0.8/shared/interfaces/AggregatorV3Interface.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// solhint-disable-next-line interface-starts-with-i
interface AggregatorV3Interface {
  function decimals() external view returns (uint8);

  function description() external view returns (string memory);

  function version() external view returns (uint256);

  function getRoundData(
    uint80 _roundId
  ) external view returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);

  function latestRoundData()
    external
    view
    returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);
}
"
    },
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}
"
    },
    "contracts/MinimalNav.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import "@chainlink/contracts/src/v0.8/shared/interfaces/AggregatorV3Interface.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

/**
 * @title MinimalNav
 * @notice Minimal NAV (Net Asset Value) oracle for RWA fractional tokens
 * @dev Implements Chainlink AggregatorV3Interface for compatibility with existing price feed infrastructure
 * @dev Owner-controlled NAV updates with 8 decimal precision (standard for precious metals in oz)
 */
contract MinimalNav is AggregatorV3Interface, Ownable {
    uint256 public constant VERSION = 1;
    uint8 public constant override decimals = 8; // 8 decimals for oz (gold/silver standard)
    string public override description;

    int256 public latestNav;
    uint256 public latestTimestamp;
    uint256 public latestRound;

    mapping(uint256 => int256) private roundNav;
    mapping(uint256 => uint256) private roundTimestamp;

    event NavUpdated(uint256 indexed round, int256 nav, uint256 timestamp);

    /**
     * @notice Initialize the NAV oracle with an initial value
     * @param _initialNav Initial NAV value (8 decimals)
     * @param _description Description of the NAV (e.g., "ION.au NAV")
     */
    constructor(int256 _initialNav, string memory _description) Ownable(msg.sender) {
        require(_initialNav > 0, "Initial NAV must be positive");
        description = _description;
        _updateNav(_initialNav);
    }

    /**
     * @notice Update the NAV value (owner only)
     * @param _newNav New NAV value (8 decimals)
     */
    function updateNav(int256 _newNav) external onlyOwner {
        require(_newNav > 0, "NAV must be positive");
        _updateNav(_newNav);
    }

    /**
     * @notice Internal function to update NAV and increment round
     * @param _newNav New NAV value
     */
    function _updateNav(int256 _newNav) private {
        latestNav = _newNav;
        latestTimestamp = block.timestamp;
        latestRound++;

        roundNav[latestRound] = _newNav;
        roundTimestamp[latestRound] = block.timestamp;

        emit NavUpdated(latestRound, _newNav, block.timestamp);
    }

    /**
     * @notice Get data for a specific round
     * @param _roundId Round ID to query
     * @return roundId The round ID
     * @return answer The NAV value for that round
     * @return startedAt Timestamp when the round started
     * @return updatedAt Timestamp when the round was updated
     * @return answeredInRound The round ID
     */
    function getRoundData(
        uint80 _roundId
    )
        external
        view
        override
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
    {
        require(_roundId > 0 && _roundId <= latestRound, "Round not found");
        return (_roundId, roundNav[_roundId], roundTimestamp[_roundId], roundTimestamp[_roundId], _roundId);
    }

    /**
     * @notice Get the latest NAV data
     * @return roundId The current round ID
     * @return answer The latest NAV value
     * @return startedAt Timestamp when the current round started
     * @return updatedAt Timestamp when the current round was updated
     * @return answeredInRound The current round ID
     */
    function latestRoundData()
        external
        view
        override
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
    {
        require(latestRound > 0, "No data available");
        return (
            uint80(latestRound),
            latestNav,
            latestTimestamp,
            latestTimestamp,
            uint80(latestRound)
        );
    }

    /**
     * @notice Get the version of this aggregator
     * @return version The version number
     */
    function version() external pure override returns (uint256) {
        return VERSION;
    }
}
"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "evmVersion": "paris",
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    },
    "metadata": {
      "useLiteralContent": true
    }
  }
}}